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From "Hong Tang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6467) Performance improvement for liststatus on directories in hadoop archives.
Date Mon, 04 Jan 2010 23:44:54 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12796437#action_12796437
] 

Hong Tang commented on HADOOP-6467:
-----------------------------------

Some general comments on the document:
- Should mention that the outputDirectory must end with ".har".
- Can we do away with the file names for a directory in the index file now that all files
under the same directory should be clustered in a contiguous region in the index file?
- How is FileStatus serialized? Assuming you use FileStatus.Writable, then we need to make
sure that FileStatus serialization format being kept stable.
- Should explicitly mention that forward compatibility is not maintained.


> Performance improvement for liststatus on directories in hadoop archives.
> -------------------------------------------------------------------------
>
>                 Key: HADOOP-6467
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6467
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Mahadev konar
>            Assignee: Mahadev konar
>             Fix For: 0.22.0
>
>         Attachments: Archives_performance.docx
>
>
> A liststatus call on a directory in hadoop archives leads to ( 2* number of files in
directory) open calls to the namenode. This is very sub optimal and needs to be fixed to make
it performant enough to be used on a daily basis. 

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